Dennis Seidenberg has begun taking contact, marking a sizable step in his road back from ACL/MCL surgery.

Seidenberg, who had surgery in early January after tearing the ligaments in his right knee on Dec. 27 and being ruled out for the season, stayed out after Monday’s morning skate and did one-on-one battle drills in the corner with Jordan Caron and Andrej Meszaros. Seidenberg has been skating since April 8, doing more and more until eventually joining the team in practices late last month.

The 32-year-old had said last week that he felt good enough to play, but that he still wasn’t healed. Now that he is taking contact, the chances of him returning this postseason — assuming the Bruins advance past the Habs — become much more realistic, but the timetable is unknown. Daniel Paille, who was working his way back from a concussion, had begun taking contact on April 25 before playing May 1, but Seidenberg has been out much longer and such timetables vary from player to player and injury to injury. It’s safe to assume that Seidenberg would need at least a week of contact before the team could start considering him as an option to play.